psychic pokemons and attacks are super effective
Ghost & Flying. I believe that's it! Not dark or bug because although they're super-effective against Psychic, they are not-effective against Fighting. And not Psychic, because though it's super-effective against Fighting, it's not-effective against Psychic.
Water and Grass attacks are super effective against Onix.
super effective is bug
Steel is super effective against rock type pokemon.
Rock, electric, ice, and psychic types are super effective against Crobat.